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Grok Code Fast 1

xAI · Grok

Deprecated xAI coding-focused model whose old slug now redirects to Grok 4.3 for coding and web development workloads.

Part of Grok family · Other versions: Grok 4.3 , Grok 4.20 , Grok 4.1 Fast , Grok 4
Type
language
Context
256K tokens
Max Output
256K tokens
Status
deprecated
Input
$0.2/1M tok
Output
$1.5/1M tok
API Access
Yes
License
proprietary
coding agentic tool-use software-engineering reasoning fast deprecated
Released August 2025 · Updated May 16, 2026

Overview

Freshness note: Model capabilities, limits, and pricing can change quickly. This profile is a point-in-time snapshot last verified on May 16, 2026.

Grok Code Fast 1 is now a deprecated xAI coding-specialized model. xAI’s May 2026 model-retirement guide says grok-code-fast-1 retired from the API on May 15, 2026 at 12:00 PM PT, now redirects to grok-4.3, and should be replaced explicitly for code workloads.

This page remains useful for teams auditing older editor or agent integrations, but it should not be used as a new-work recommendation.

Capabilities

xAI’s launch materials emphasized the model’s fit for everyday agentic coding:

  • Repository-aware coding workflows with common tools like grep, terminal commands, and file editing.
  • Fast implementation loops for bug fixes, refactors, feature slices, and codebase questions.
  • Strong support for mainstream languages including TypeScript, Python, Java, Rust, C++, and Go.
  • Good instruction following for scoped engineering tasks where speed matters as much as quality.
  • Practical fit inside agentic coding surfaces such as Cursor, GitHub Copilot, Cline, Windsurf, and similar tools.

That historical positioning is now superseded by the Grok 4.3 migration guidance. For concrete and iterative coding work, route new xAI callers to Grok 4.3 and tune reasoning effort, tool policy, and prompt shape there rather than depending on the deprecated slug redirect.

Technical Details

xAI described Grok Code Fast 1 as a coding-first reasoning model designed around native tool calling. The public xAI API pricing references still list the retired route at this snapshot, but the retirement guide is the safer planning source. Historical anchors:

  • 256K context window.
  • Text-only input in the public pricing card.
  • A coding-oriented reasoning profile tuned for agentic editor workflows.

Like other xAI model pages in this repo, maxOutput is recorded as the documented context ceiling for quick comparison. Teams should still set explicit output limits in their tooling rather than relying on that number as a guaranteed generation cap.

Pricing & Access

Published xAI API pricing (per 1M tokens):

  • Input: $0.20
  • Output: $1.50
  • Cached input: $0.02

Historical access options:

  • xAI API
  • Launch-partner editor and coding-agent platforms
  • xAI ecosystem tooling where Grok coding routes are exposed

xAI’s launch materials also made the model temporarily free on selected partner platforms, but teams should budget based on the published API pricing instead of promotional rollout terms.

Best Use Cases

Use this page for:

  • identifying old grok-code-fast-1 calls
  • comparing historical behavior with Grok 4.3
  • updating coding-agent configs and docs
  • removing assumptions tied to the old coding-specific price point

Do not start new coding deployments on Grok Code Fast 1. xAI’s replacement guidance is Grok 4.3, while cross-provider coding tools such as OpenAI Codex and Claude Code remain separate product choices.

Comparisons

  • Grok 4.3 (xAI): Recommended xAI replacement for coding and web-development workloads.
  • GPT-5.3-Codex (OpenAI): Coding-specialized OpenAI route with first-party Codex product support.
  • Claude Code (Anthropic): Tool surface rather than a single model page, but often the more practical comparison for terminal-based agentic coding.